Partial wave analysis of πproduction in two-photon collisions at LEP
Petersburg Nuclear Physics Institute, Gatchina, Russia
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Accepted: 28 February 2006
Published online: 31 March 2006
The reaction γγ → π+π-π0 with quasi-real photons is studied with a total integrated luminosity of 663pb^-1, collected by the L3 detector at LEP at center-of-mass energies from 183 to 209GeV. The results of an energy-dependent partial wave analysis in the mass region 1.1≤M(π+π-π0)≤2.2GeV are presented. The reaction is dominated by a 2(1320) formation. A strong signal consistent with the first radial excitation of the isovector tensor state, a 2(1700), is present and confirms the previous L3 observation. Its two-photon partial width is found to be Br(3π) = 0.37+0.12 -0.08keV, the relative branching ratio of ρ(770)π to f 2(1270)π is 3.4±0.4. For all observed states the product of γγ partial width and 3π branching ratios is measured.
PACS: 11.80.Et Partial-wave analysis – / 13.60.Le Meson production – / 13.25.-k Hadronic decays of mesons – / 14.40.-n Mesons –
© Società Italiana di Fisica and Springer-Verlag, 2006